9905-146

About the 9905-146

Control unit 9905-146 is available in forward acting or reverse acting units, the unit is comprised of twenty-nine terminals with reset, droop, load gain, ramp time, low idle speed, gain, rated speed and low idle speed, start fuel limit, and actuator compensation potentiometers. Before starting the control and prime mover all of the potentiometers need to be set, be cautious when turning the potentiometers as over-torquing the potentiometers can affect the performance, there is only one multi-turn potentiometer on the control which is the rated speed potentiometers. 

The load gain potentiometer can be adjusted after the start-up of the engine and control unit if the full load reads six volts or anything lower than one hundred percent than what is proportional to the full load, then the current transformers being used with the control might the wrong size for what is required of the control. The CT (current transformer) output is typically 3-7 A or a 5 A nominal at full load. 

If the control unit that you have is a high-voltage model and the engine will not start the cause of this issue is like the positive sources for the contacts connected to the following terminals; fourteen, seventeen, eighteen, and nineteen take this from terminal sixteen rather than terminal zero, to rectify this error connect the positive source for these terminals to terminal zero rather than terminal sixteen. 

If interested in the 9905-146 Woodward 2301A control from AX Control INC we can be contacted by email or phone to check the availability of the product.